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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f20fe2843e9b591f1d0de0a818fa467473370dbb7b40b3131817ba63a8fb2d' 
  AND token = 'ULevQvuGXJonkMUHwRw959f1Dk1bNhd85619CasrM5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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