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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90548d82965f8cd9c0b4fe4bc0bde8506dc65d56651ea1def37faf44fb2fec1e' 
  AND token = 'D/N3QB/XwnhW3tqwuYQcQBSSgGFdbCHaltnemy2IVhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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