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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149c65d49df86a2b49497996d1e68ce0f1692da57aedb3b4751907b7ec7ee67c' 
  AND token = 'XqPkjpb6+etg43rjlm/Rr92rl1GqhMEwyl5d4FLStbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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