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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2d4a99d6d184b19ccd395144a395723bd3b40a443f9405981c2891285b42ab' 
  AND token = 'xOTzFHMkuddFNV7RouJIuMO2Cyanyt+oI4advmDjcKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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