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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9bc05bde03d0b1ef4b7e54a8c0b2589f6d819e729fbb932420897995710365a' 
  AND token = 'kh7lbgNbYLbj2F/riJrUcZ9pWO5g6NsAi8OyWPELmjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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