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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c804f7ce6d71a632b2df718f0dbe2146fe3c1e47fcf8792a193e7729544cb344' 
  AND token = 'Uv79yMOAJwo7/Wp7aUVhYIgDx4C44XT9JtEcKEQ3VA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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