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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612035152e0bfbe7cb2d5a7a6272c6caff2c1be3156cdf7463a31d3f14c0d2ef' 
  AND token = 'vBIjey08VAUVdvgEhsaV22sXIXJYGfbETVpMiAKr0X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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