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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7b7c52336bd939e933323ff55d6832a1fc9efffb23b590e1c5232b350eaf0b' 
  AND token = 'aT8M0Bk7ssFoSt5thzysFrWk1m+wqsK6SBgEz18Dt34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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