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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be07eaf20a41e4f041843d5e5eb9814e801d1fc6c9ffb9aecc2c639cf6bc9b8' 
  AND token = 'Xpb7EcdLV/MqS2YJ3+LTWuFCf0YiC3x0K0a843VCQ8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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