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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29b6678b989e1d85b619017e0e8bbf1deabeb0d92f5e4267e4c1acabf577a23' 
  AND token = 'IVqsvhcot4J0oj8W6sPK8QoO5641OpLLPimElUSShlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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