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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b449b2026260e761093750c3aab15ab03b65eada9d7db4fe1bcf9b72f5bad9' 
  AND token = 'iQQkfhlCBrPc/UNDLu7JlpbGu0O85CvOUvw6sxUR7q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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