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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f8661f6fffdb9b08b6f9fc1fd033b8e348fc58632e69ba2b234bfb603d15dc' 
  AND token = 'L1HnH9nzBrAo/dEFqd37G4AuSv4w61sbr/fJfDqNZK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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