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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd671dc0fe47c4d15b995e3e2b9e0c5ae1c908f7a20eca3c55cfe79fe788b9067' 
  AND token = 'q2Eqwo5YxdDnZvMwZp6j9xVtjPWHUcmt1XR2lnm2AH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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