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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cecf18cb287a9cbb1bf2c05a47798e9f2705d497af37cc8dbd01f1dd1107f4' 
  AND token = 'rf72/9l4PzMov/YJONqQWDbsGsdqb58nl3X8A9B3mrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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