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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e74717c2b7c4a200b11f6a45e47c6776d0b19979a08595d62153745279d6b5f' 
  AND token = 'RgKZiSUFqJXcMKST0DdEPWXf7+bMGXH4evT8FHiRq0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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