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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfe357809cd48e7b797385f567650ddd4a7349fd1ea40a154a03fe33ef02763' 
  AND token = 'z9ubXoLrHEXgQhAD8QVo2wXZB2i2NL8uxSNSrSS2dRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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