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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716a57b2ade01e1e32cf2660023b0a15744f20d184823e74efa65a0c027bb01a' 
  AND token = 'vScBQbMQ+q3JWtsaj/N5Gv4ghQIZena5N1aRTKYbkFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}