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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c759e282ae85d9ab4ded7f1f342b8b83c3b14caaed1fcc3152bda40e7f506f8' 
  AND token = 'Dd/4DDWgNFUD+co1a8UZiWMuCPAz0ynmqZ3O2IeYs30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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