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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29463b6a96830031aa2f71a34d6eb8494324af943632dd09da109302c51c27ef' 
  AND token = 'qTlZbkEO2z3ambhM+axpXHbaQc6V22Nq5iMfkxn43c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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