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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efcf9f8f159d3833fcd9fd081da5d60f93103d978105a6d865ef3528e44d3e7d' 
  AND token = 'B3qyCYCnGXxk2n/ZTVrEE44EVRtosOIDhIH4s8Qzh3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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