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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f17b5f3dd9f5840fca08512aba05b5ecaadf64a5ac432c51f7acccb64165c3' 
  AND token = 'YvCaVr4OqK1ZVZFUIrn3n0ORHOWAetcCh1ebpBmywFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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