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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aea840437572ed3ae14a1d70786bc9d8419d94836d5d56a9b2ab3b1d0b5b398' 
  AND token = 'mmFYU3ecVK6nHjQk8BjCBCuP6XzJa3I0UW77mTGXWOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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