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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef93b670a0b4131a5f1926f5411a08f17515b69d407a3300e00d835abd4ef2a9' 
  AND token = '4A63odV2Wu9qD9OzHOdug8lTccFErDY3Q3vYRJR+Kos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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