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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6353556e96054ccf066962d939e7c10f7688561596db6b56afa278b6ba76c42b' 
  AND token = 'AfvcFpnO6VCgFDRcZpV53x5SYd/NB+CREB6RyDErwok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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