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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74e29047c8ac6b57777628807c8918af0f061c8f700e9983136bc1ac903a837' 
  AND token = 'cEDERTmIiFf1+7+FiiKBLQXGgTlTns4zz7+omZVWTys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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