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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b22b91eca21a6bd6ebba3a0bca68104cf8b7ee6c68e08ac4b9f692e175881d6d' 
  AND token = 'CsVB8hSHYpbCMS9NeKijqn9RaR/XC3EAIiTtOTQRT7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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