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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7fe83f1a1e49fa5b8e43ca80410c3b169869fd9bd06a7ff0a1fb54bcf6af89' 
  AND token = 'tajJvymNXwknTSCq60BCmo0dpSuzIOsgTSjE3PNY1L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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