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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74db987aa6e8833944ac0417d1ad00eb8cdee72ee3a07409c0268c5b796b8e83' 
  AND token = 'OeU0Q+Bq6unba5c9QwuDjncEOT7ekLUaJB3CJisILT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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