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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dfcb1d0a2a100fb847a795cbde43d8724322c016c42fa97b2e44bc0b6b819b9' 
  AND token = 'lZm0++zoX6hSCHOIgasEQgvf+7rnLOHGG20z/AomLRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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