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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eccb0e5318a08dd73450d07c6844f4b656a66d9c74b1336772a1d95d9d90cddf' 
  AND token = '9rKBZm/Oxm1dZPaTW3CtQ2OL9pbqtupmXKk8xzNPiTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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