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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5aad9b186bbe8301e9aaa22e7662ceeae254cb73939409382e26eac89f0feff' 
  AND token = 'Z6D3piyOBhjFyyGOfB8r0IRNLud6iftg1NMCpI4J6Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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