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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcf0373b997843075e57f9cdeebfea95b5c9c2011d24380068fb063970c25c8' 
  AND token = 'Gl0rlR+dSEOqVh3ajxX62zrUJfWJIoa9mcc53mBFqTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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