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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc06809b08f2ef0ae815a7968297de008355581f0024b309752afe29974703ce' 
  AND token = '/QLB+fpf6yJRDc4oIoWOsBpNj0Wq+iC8i8A+TUL944E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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