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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19bd83cfbc945e58cecb1c188f352a131cdadf11114b66710cd4869cf6a16bf' 
  AND token = 'hURZa5uAWaIna/ypvmClmeIxKC/EHD68rFvi6tVLa0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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