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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf7e25bfb3010eb66295d0c8d3f22c8bec8b259fdd9d659caa0882b8d064294' 
  AND token = 'RDzfOPU15YW4u6s8xafv2OuuBreYe5TLzXMRt7Ma5dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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