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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa1b158a9038ca742b72f56b14ed6a27452b077485b26ac193171da9123e63f' 
  AND token = 'pJfVtOGmRRpse/g2JLfb8+MJCaPdaTNyY4R9WX6UDag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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