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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f61ca961f8d03e7a2f588048cd87def41439af9d79bf7698ff4904f48fe51c' 
  AND token = 'WYEbyH+Ocb9OcwR3JPvU9/knzFiq1F/hoN7i9jUi4Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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