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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0774f964213306ab177941a0947dbdea10d2f3f29bae89e45685264e46197d63' 
  AND token = 'nSyiOX3Ux1vtc01nKikTfxBJjLaXAG0oTDFmxZjPnlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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