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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03aaa2cdc74ffc2cc9a9926f3a468f9ab300a6b25995bb072addd33426723ca7' 
  AND token = 'Z5nVkUEZqziPRquwnTuJI8QYdylq2nkkOp14HfbYehY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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