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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bab7a2e204ec6691e28da52476136f5e987779aaa4fc8c96dd9f973e241413' 
  AND token = 'JcLfevjG5VWLi7fz08K2HNLQwSNJvTyq6yYhoCGeEp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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