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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb84247ff9b892feba924eb9f40c71e0ea0891f73071c8b2ddc043ee95739b3' 
  AND token = 'OQQ1WWl4FPz7cpiO5BC7T6dfuq0Tc4cgI/i+SBUWPt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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