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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867fe4310b57859e2d3df0a7e7039d0d0b81c906ddd5ab1abbebe1619c678a79' 
  AND token = 'Gh4OIglbrRSgC8BOA4W96Us1LRUG4WeET1oc3Qip5/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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