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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3200e34ef7a9f369164a45d25e3a0c8ad80f87ec0f04d5e82577361497ab126' 
  AND token = 'w0eFtzEtdOE74EfPqMG1+uoMa4YlGAik55Z1iTnpT9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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