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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34c82e0cad10f7b3d0d2bba2b74d9aba4e4c522b2de0963e57b1a4647d81d1e' 
  AND token = 'b5AWdOb2KnPqQnM2hjExDeZWK3LQhrNj0zkWoTs6WFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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