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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8538d8efb7a9ed4edab8bb3fabb7cc76a902d9a5d2f868716e59c8884011fc81' 
  AND token = 'nOyzZVmDQFiFlaBNQK7ukn/tEODe7xrLuE90EacdKEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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