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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827aab6334ef5f59f3fd7d394eebcc92d1fbcb1bae0eb938dc75184be093bd5a' 
  AND token = 'ykLd9TK89kqX2Jy/wmAS3Yb0Cf0KE7+bhuaaJ6E6PdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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