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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e924581426aba3bcd7dc4c5a2ba9b703ea4d0662cb3e6b5dd9573c707069bd7' 
  AND token = 'NqGnHo7mKJtEbhtbJwTB2v182AGZHQ882TDk0b+I23o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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