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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b890c51f398f8c9162c3d7cc8ee58b0332518eba8671ecdcc1e80469f04f483' 
  AND token = 'YJh0Pw2qgs9xwVIu0IDsh6QC0jwcvsQC4m4CQNjQ5ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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