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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f087d51637f6c6f2bf544039bc0ab61f57d7e1cb6440f3a14e3efcef4568b2' 
  AND token = 'EpQZib9Fm1D0B6We4s01C0Y7BFcGbYWZ5xk0sg3TOGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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