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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92412ae2d9416c5b9f0cf31da1e303374d831e2ea1735e410aba8f04c81a0c4a' 
  AND token = 'bDi40X4Bzf6smX6SIHgeWG/yDdniR3PxuXwtVogntTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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