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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c83766dd30f5d67bb3268e36c2f2403d17385c9c93cda0e9298d4f2bffb53c' 
  AND token = '2yfoZuYHrYnlAKZTXV/tt/91nLVLwNXY45oq9sZC6ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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