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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029d03fbf0ccf02b2131b56ecd0eb9aebfe3361c5d9119523ae04c4dbf5c1139' 
  AND token = 'CMupg4thv4mxj6vgJITe/FW9wIkicfReF0HOBBiFeAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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