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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1eac11f92dd3bca1e3361b215dc5624242f04b5f602c87cefc7823dbad4abb6' 
  AND token = '50o+qAoVvYhrYEC6i+uhz5nPoigfE8rXJeeOG9+N88A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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