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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16fa6f4d41ecb533be0b86e91156c09cb679ab8e023fd62e96a4c2982f73d37e' 
  AND token = '4kRPaf8Y8ypbme4qTkS6ASKEqZyT0ugIPCVNs031vEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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