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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fe16f5f6014479eecbfa77a133ad2e506630d5e363a3878f71034ccdb9d249' 
  AND token = '4UqgvHwM+ID6lnsLGGJQPR0La2b56PgOV1Bs8kwaeNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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