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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b961e082733a8940116f48bdc6a1785a0dd6ee70315c3ba8c422a62d89d3470' 
  AND token = 'LYyAUiZB9EgIn3fimDMrpK/s2ynXIHrP00DaQdUaC0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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