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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b34a3a50093c9b9f50894371edad52a8becca00ec8ec9b001b9a5ac60037950' 
  AND token = 'my7yfR6wx0JWIomrGH9qj2Nv/ivCO+VtQJ4zqgGjVco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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