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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a8d0d45ebdc47993f950ab30bde76de0ddf234d66805861af7c9c57dca8ef2' 
  AND token = 'zMPkHbxDMGNlTWW1vovUI3JFZjOoSi1zif1XpVzdVDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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